Summary of Significant Accounting Policies - Annual Depreciation Rates (Details)	Dec. 31, 2019
Motor vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Salvage Value, Percentage	20.00%

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant